//
//  Book.h
//  类的变量和属性
//
//  Created by Qinghe on 2020/6/13.
//  Copyright © 2020 Qinghe. All rights reserved.
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface Book : NSObject
//strong 是强引用，
//weak
//assign 是弱引用，一般用来修饰基本数据类型。float int CGFloat NSInteger BOOL 枚举
//
@property(nonatomic,strong)NSString *name;
@property(nonatomic,assign)float price;


@end

NS_ASSUME_NONNULL_END
